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setuptools already uses CFLAGS. Passing CFLAGS with additional flags as extra compile arguments causes CFLAGS to effectively get passed twice: $ make -C tools/perf V=1 JOBS=1 ... building 'perf' extension gcc [CFLAGS] -fPIC -Iutil/include -I/usr/include/python3.14 \ -c /root/linux/tools/perf/util/python.c \ -o python_ext_build/tmp/root/linux/tools/perf/util/python.o \ [CFLAGS] \ -fno-strict-aliasing -Wno-write-strings -Wno-unused-parameter \ -Wno-redundant-decls -Wno-cast-function-type \ -Wno-declaration-after-statement Reviewed-by: James Clark <james.clark@linaro.org> Signed-off-by: Jens Remus <jremus@linux.ibm.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Hendrik Brueckner <brueckner@linux.ibm.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jan Polensky <japo@linux.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>